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Automation of Mode Locking in a Nonlinear Polarization Rotation Fiber Laser through Output Polarization Measurements
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Study on skylight polarization patterns over the ocean for polarized light navigation application.

Le Guan, Shiqi Li, Liyuan Zhai

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    Skylight polarization patterns over the sea are similar to land, enabling reliable navigation for ships and drones. This research confirms the feasibility of using polarized skylight for navigation at sea.

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    Area of Science:

    • Optics and Navigation
    • Atmospheric Science
    • Marine Science

    Background:

    • Polarized skylight offers precise navigation without time-based error accumulation.
    • Skylight polarization patterns provide crucial directional cues like the solar meridian.
    • Previous studies primarily focused on land-based skylight polarization.

    Purpose of the Study:

    • To investigate skylight polarization distribution patterns over marine environments (East China Sea, Yellow Sea).
    • To compare observed marine polarization patterns with land-based data and simulations.
    • To assess the applicability of skylight polarization for navigation in maritime settings.

    Main Methods:

    • Continuous full-sky imaging polarimetry during day and night.
    • Comparison of experimental data with simulations using libRadtran radiative transfer software.
    • Analysis of polarization patterns under varying sky conditions (clear and cloudy).

    Main Results:

    • Skylight polarization patterns over the sea closely resemble those over land.
    • Cloudy conditions significantly reduce the accuracy of polarization angle and degree.
    • Daytime and nighttime navigation cues (solar/lunar azimuth) were accurately reflected in polarization patterns.
    • Nautical twilight polarization is influenced by both solar and lunar polarization, with solar dominance.

    Conclusions:

    • The established skylight polarization patterns are applicable for navigation over marine environments.
    • Polarization navigation is feasible for ships and unmanned aerial vehicles (UAVs) at sea.
    • This research validates a robust, interference-resistant navigation method for maritime applications.